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Answers and rating deltas for

How this works? I can't understand this snippet

Author Votes Δ
Sergiu Paraschiv 2 +0.97
Jamiec 1 -0.42
Obaidul Kader 0 -0.38
AshTyson 0 -0.49
Navin Gelot -1 -3.53
Last visited: Sep 4, 2019, 3:46:46 PM